[a_lazy_dude]

some steps that may help you debug:

- is there any visible residue/film/funk on the battery's contacts? or on the phone's battery contacts? if so, use a q-tip and some rubbing alcohol to clean.

- do you have access to a volt meter? if the battery is good, it should measure somewhere in the ballpark of 3.7V between the + and - terminals

- does the little "void" sticker on the bottom left still read "void" in pink, against a pure white backdrop? if it's blurry, or if the sticker is completely pink, this is an indicator that some level of water damage may have occured.

good luck!